Since version 1.16 we can't put on our own skins (that we upload into the game). This bug continues already in version 1.18.20.21. That is, in the latest beta version of the game. I hope this will be fixed soon.
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We're tracking this issue in MCPE-151507, so this ticket is being resolved and linked as a duplicate.
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What happens exactly when you try to equip your skin in 1.18.2 Hotfix?